Hi Gerd, thanks for the fast reply. I tried "java -ea -Xmx16G -Xms16G" but this doen't make any difference on my machine, AMD Ryzen 7 3700X 32GB Ram 2 SSDs 1TB each see the log extracts below. Ciao, Franco ----O5M-------------------------------------------------------------------------------------------------------------------------------- Splitter version 597 compiled 2020-01-30T14:10:47+0000 boundary-tags=use-exclude-list cache= description= geonames-file=/home/franco/map_build/cities15000.zip handle-element-version=remove ignore-osm-bounds=false keep-complete=true mapid=65000001 max-areas=2048 max-nodes=1200000 max-threads=16 (auto) mixed=false no-trim=false num-tiles= output=o5m output-dir= overlap=0 polygon-desc-file= polygon-file= precomp-sea=/home/franco/map_build/precomp/sea-latest.zip problem-file= problem-report= resolution=13 route-rel-values= search-limit=200000 split-file= status-freq=120 stop-after=dist wanted-admin-level=5 write-kml=dach.kml Elapsed time: 0s Memory: Current 16384MB (19MB used, 16365MB free) Max 16384MB Time started: Sat Dec 19 10:10:21 CET 2020 Time finished: Sat Dec 19 10:15:44 CET 2020 Total time taken: 5 minutes 22 seconds ---PBF------------------------------------------------------------------------------------------------------------------------------ Splitter version 597 compiled 2020-01-30T14:10:47+0000 boundary-tags=use-exclude-list geonames-file=/home/franco/map_build/cities15000.zip handle-element-version=remove ignore-osm-bounds=false keep-complete=true mapid=65000001 max-areas=2048 max-nodes=1200000 max-threads=16 (auto) mixed=false no-trim=false num-tiles= output=pbf output-dir= overlap=0 polygon-desc-file= polygon-file= precomp-sea=/home/franco/map_build/precomp/sea-latest.zip problem-file= problem-report= resolution=13 route-rel-values= search-limit=200000 split-file= status-freq=120 stop-after=dist wanted-admin-level=5 write-kml=dach.kml Elapsed time: 0s Memory: Current 16384MB (19MB used, 16365MB free) Max 16384MB Time started: Sat Dec 19 10:33:28 CET 2020 Time finished: Sat Dec 19 10:51:12 CET 2020 Total time taken: 17 minutes 43 seconds